Also, what are the step of the communication between the PIC and the W5500?
The PIC is giving the data to the W5500 at the very startup (power switched on) of the board or the W5500 is asking at a particular time?

Hi, all.
W5500’s MAC address can be configured with write MAC address to SHAR by user MCU instead of PIC12F519.
If you have already unique MAC address value, Just write the value into SHAR of W5500 using your MCU. So, don’t need
PIC12F519.